YOUNGSTOWN AIR RESERVE STATION, Ohio -- Air Force Reserve Lt. Col. William Kowalewski, commander of the 910th Civil Engineer Squadron, rappels from a building during an exercise at the fire training compound commonly known as the burn pit here, June 6, 2011. This training is part of requirements that keep the 910th firefighters combat ready. U.S. Air Force photo by Senior Airman Megan Tomkins